[1] https://criminal.findlaw.com/criminal-procedure/what-is-a-ju...
Today nobody else does this, England for example only really uses jury trial to decide serious criminal cases (for minor stuff there isn't a professional judge at all, a panel of lay magistrates decides, they mostly seem disappointed rather than angry - like parents whose teenager was caught smoking).
Because the defendant was a musician in this case.
Leonard French—a YouTuber and actual copyright attorney—does a good job covering the legal standards and issues here: https://youtu.be/t-tsw6Z4eHc.
A jury of random people can be confused and then convinced by lawyers. That's the way they like it, and that's the problem with jury selection - they chose people specifically because they are not knowledgeable.
To start: Not removing jurors simply because they're knowledgeable or have critical thinking skills.
Ummmm..... the Magna Carta was not about protecting the commoners from the king. It was about protecting the peerage from the king. "Jury of peers" is a jury of other members of the peerage trying a peer. Commoners were not part of the program.